Idle And Initiate - Keithley 6430 Instruction Manual

10-16 Triggering
Remote triggering
Trigger model (remote operation)
The trigger model flowchart in Figure 10-9 summarizes remote trigger operation. Operation
is controlled by SCPI commands from the Trigger Subsystem. Key remote commands are
included in the trigger model. Also note that the GPIB defaults are denoted by the "✛" symbol.
The primary actions of the trigger model are Source, Delay, and Measure. The source action
outputs the programmed voltage or current value, and the programmed delay provides a set-
tling period for the source before the measurement is performed.
The trigger model consists of two layers (Arm Layer and Trigger Layer) to provide versatil-
ity. Programmable counters allow operations to be repeated, and various input and output trig-
ger options are available to provide source-measure synchronization between the SourceMeter
and other instruments (via the Trigger Link).

Idle and initiate

The instrument is considered to be in the idle state (ARM annunciator off) when it is not
operating within the trigger model layers. While in the idle state, the instrument cannot perform
any measurements. An initiate command is required to take the instrument out of idle. The fol-
lowing commands perform an initiate operation:
•
•
•
Conversely, if the unit is taking readings, most commands (except DCL, SDC, IFC, and
ABORt) are queued up and will not be executed until the unit returns to idle.
When auto output-off is disabled (:SOURce1:CLEar:AUTO OFF), you must first turn the
source output on before sending the :INITiate or :READ? command. The :MEASure? com-
mand will automatically turn the output on. Note that after the instrument returns to the idle
state, the output will remain on.
When auto output-off is enabled (:SOURce1:CLEar:AUTO ON), any of the above three
commands can be used to initiate operation. The source output will automatically turn on at the
beginning of each SDM (source-delay-measure) cycle and turn off after each measurement is
completed.
:INITiate
:READ?
:MEASure?